He made his senior debut in the second half of the 2013–14 season and in mid-2015, Ismajli went on a one-season loan to Football Superleague of Kosovo side Prishtina.
In February 2016, Ismajli signed a three-and-a-half-year scholarship contract with Croatian First Football League side Hajduk Split after a trial.
On 14 May 2016, he made his senior debut for Hajduk against Zagreb in the Croatian First Football League and playing the full 90 minutes as a central defender in a 3–2 win.
[3] On 18 August 2016, he made his UEFA Europa League debut in a 2–1 defeat against Maccabi Tel Aviv at Netanya Stadium in the playoff round after being named in the starting line-up.
On 5 June 2017, Ismajli received a call-up from Kosovo U21 for a 2019 UEFA European Under-21 Championship qualification match against Norway U21[7] and made his debut after being named in the starting line-up.